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photoshop1234 [79]
3 years ago
6

Last year there were 48 science projects submitted by students at a science fair. This year there are 52 science projects.

Mathematics
1 answer:
Lapatulllka [165]3 years ago
4 0

Answer:

52 - 48 = 4

Around 7%

(Please tell me if this is wrong)

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225 students in my school, or 15%, have blond hair. What is
White raven [17]

Answer:

1500 students

Step-by-step explanation:

Divide the number of blonde students by the percentage they are of the school.

225/0.15 = 1500

The total number of students in your school is 1500.

6 0
3 years ago
Read 2 more answers
A car travels 65 km in 45 minutes what is the average speed of the car in km/h
nekit [7.7K]
So to begin your problem, you know that your car already has an average which is 65km/45 mins. The problem wants you to change this to km/hr. This means that you need to convert minutes to hours. A simple way to do this is by using fractions. 
Set your problem up with fractions similar to this:
65km/45 mins x 60 mins/1 hr.
the whole point is to cancel out your minutes, and leave the hours as your new unit for the denominator
65km/45 x 60/1 hr. 
now you want to reduce (I divided the first fraction by 5)
13km/9 x 60/1 hr.
780km/9hrs. 
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5 0
4 years ago
Read 2 more answers
How do I complete this formal check?
natima [27]

Answer:

Step-by-step explanation:

The first two steps are for the purpose of eliminating fractions.  Doing so results in 4(2x - 5) = 9(x - 2), which is to be solved for x.

Perform the indicated multiplication, obtaining:

8x - 20 = 9x - 18.

Then combine like terms:  -2 = x, or

x = -2.

To complete the formal check, substitute -2 for x in the first equation.  This results in:

(1/3)(-4 - 5) = (3/4)(-2 -2), or

        -3       =        -3

... which is obviously true.  

8 0
4 years ago
Please help
ale4655 [162]

Answer: its A or B I think its more of B than A

4 0
3 years ago
The temperature at midnight was -6 degrees celsius. By 7 am, it had risen 6.5 degrees. By noon, it had risen another 3.9 degrees
Studentka2010 [4]

Answer: 4.15 degrees

Step-by-step explanation:

-6 + 6.5 + 3.9 - 4/25 = -6 + 6.5 + 3.9 - 0.25 = 4.15 degrees (assuming that the am in the fourth sentence is a typo)

4 0
3 years ago
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